Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hanh tri » thanh tri, hanh tai, hanh trinh
cua nuoc » cua quoc, cua nguoi, cua thuoc
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
vuc van » luc van, thuc van, chuc van
duc van » duc va, duc tan, duc manh
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (thuoc sach)) tu lang xa hoi. hieu ve cac ((vuc van) or (duc van)) hanh tri cua nuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) tu lang xa hoi. hieu ve cac ((vuc van) OR (duc van)) hanh tri cua nuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) tu lang xa hoi. hieu ve cac ((vuc van) or (duc van)) hanh tri cua nuoc".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) tu lang xa hoi. hieu ve cac ((vuc van) or (duc van)) hanh tri cua nuoc*.